MUNICIPAL HYGIENE.
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There can be no doubt that one reason why cities did not grow so rapidly in the seventeenth and eighteenth centuries as in the nineteenth is the excessively high death rate that prevailed during the earlier period. The flood of immigration, mighty as it was, did little more than make good the places of those citizens who fell victims to grievous sanitary conditions. From the facts that can be obtained it seems to have been universally true that almost up to the beginning of the nineteenth century the death rate of large cities exceeded the birth rate. This was not because the birth rate was abnormally low, but because the death rate was abnormally high. In the medieval city both birth rate and death rate were far higher than at present. Infant mortality must have mounted to a gruesome height. The uncleanliness and overcrowding of city dwellers, now largely relegated to the slums of our great cities, was the normal state of nearly all classes of society in the London and Paris of Louis and Elizabeth. Mr. Frederick Harrison has condensed into his own vigorous language the annals of many of the historians of the middle ages.
The unsanitary conditions thus relentlessly portrayed must have had the same effect upon the health of all town inhabitants that similar conditions now exert upon the denizens of the 'crowded' and 'poor' wards of our modern cities.
So long as the city death rate exceeded the birth rate, the cities, in spite of the ceaseless thronging in of immigrants, could not grow as they have grown since. The economic equilibrium between town and country probably did not permit of any more considerable transfer of